Precautions
Electrical Hazard:
Disconnect and lock out electrical power
before installing or servicing the unit.
WARNING:
• Maintenance and service must be
performed by skilled and qualified
personnel only.
• Observe accident prevention regula-
tions in force.
• Use suitable equipment and protec-
tion.
• Make sure that the drained liquid
does not cause damage or injuries.
6.1 Service
If the user wishes to schedule regular maintenance
deadlines, they are dependent on the type of pump-
ed liquid and on the operating conditions of the
pump.
Contact the local sales and service representative
for any requests or information regarding routine
maintenance or service.
Extraordinary maintenance may be necessary to
clean the liquid end and/or replace worn parts.
Pumps with greased for life bearings
Pumps with greased for life bearings do not require
any scheduled routine maintenance.
Pumps with re-greaseable bearings
• Regrease at 4000 operating hours, but at least
once per year. Clean lubrication nipples (SN)
first.
• Use NLGI Grade 2 grease or equivalent.
Contact the local sales and service representative
for any requests or information.
Motor bearings
After approximately five years, the grease in the mo-
tor bearings is so aged that a replacement of the
bearings is recommended. The bearings must be re-
placed after 25000 operating hours or according to
the motor supplier maintenance instructions, which-
ever is shorter.
Motor with regreasable bearings
Follow motor supplier maintenance instructions.
Coupling
Check the clearance in the coupling elements regu-
larly, at least once a year. We recommend checking
every 1000 operating hours or every three months,
whichever comes first.
6.2 Inspection checklist
Check the coupling
Check the flexible ele-
ments of the coupling.
Replace the relevant
parts if there is any sign
of wear and check the
alignment.
Check the mechanical
seal
Check for leakage of the
mechanical seal. Re-
place the mechanical
seal if leakage is found.
Checking the bearing
seals
Check correct seating of
axial seal rings mounted
on the shaft. Only gentle
contact of the sealing lip
shall be established.
Check for quiet running
Check frequently for qui-
et running of the pump
with vibration measure-
ments tools.
6.3 Disassemble and replace the pump
parts
For more information about spare parts and assem-
bly and disassembly of the pump, contact the local
sales and service representative.
7 Troubleshooting
7.1 Troubleshooting for users
The main switch is on, but the electric pump
does not start.
Cause
Remedy
The thermal protector
incorporated in the
pump (if any) has trip-
ped.
Wait until the pump has
cooled down. The thermal
protector will automatical-
ly reset.
The protective device
against dry running has
tripped.
Check the liquid level in
the tank, or the mains
pressure.
The electric pump starts, but the thermal protection
trips a varying time after.
Cause
Remedy
There are foreign objects
(solids or fibrous sub-
stances) inside the pump
which have jammed the
impeller.
Contact the Sales and
Service Department.
The pump is overloaded
because it is pumping liq-
uid that is too dense and
viscous.
Check the actual power
requirements based on
the characteristics of the
pumped liquid and then
contact the Sales and
Service Department.
The pump runs but delivers too little or no liquid.
Cause
Remedy
The pump is clog-
ged.
Contact the Sales and Service
Department.
The troubleshooting instructions in the tables below
are for installers only.
7.2 The main switch is on, but the
electric pump does not start
en - Original instructions
23
